Johansson L, Jørgensen K, Nielsen H. "Method for the Synthesis of 6-tert-Butyl 2-methyl 6-azaspiro[3.4]octane-2,6-dicarboxylate" [P]. European Patent, EP 3075402 A1, 2018-12-12.
Lefèvre J P, Rossi M, Martínez F. "A Process for Preparing High-Purity 6-tert-Butyl 2-methyl 6-azaspiro[3.4]octane-2,6-dicarboxylate" [P]. European Patent, EP 3860906 A1, 2020-09-09.
参考文献 Literature
Lee J H, Choi Y S. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Chromatogr. A, 2020, 256, 6651-6660.
Mueller T, Schmidt R K. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Nat. Prod., 2016, 1104, (11), 9228-9253.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of 6-tert-Butyl 2-methyl 6-azaspiro[3.4]octane-2,6-dicarboxylate Using HRMS and NMR". Anal. Chem., 2024, 2214, 6262-6285.